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DC-8-based observations of aircraft CO, CH₄, N₂O, H₂O(G) emission indices during SUCCESS

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  • We report the first measurements of CO₂, CH₄, N₂O, CO₂, and H₂O(g) in the exhaust trails of T-39, B-757, and DC-8 aircraft at cruise conditions. Emission indices (El) derived from these in-situ measurements are presented. Results are in agreement with ground-based tests indicating aircraft act as a net sink for CH₄ and recent airborne in-situ measurements that N₂O is not an important exhaust constituent. Condensation of H₂O(g) on exhaust particles resulted in EI(H₂O(g)) values less than those expected from the combustion of fuel alone. Observed apparent negative EI(H₂O(g)) values suggest that aircraft aerosol emissions, under unique atmospheric conditions, seed cloud formation and lead to dehydration of the exhaust-influenced air parcel. Such conditions may induce the formation of cirrus clouds from persistent contrails. Comparisons with the Boeing EMIT Code show measurement-derived CO emission index values consistent with model evaluations.
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  • Vay, S. A., Anderson, B. E., Sachse, G. W., Collins, J. E.,J Podolske, J. R., Twohy, C. H. , Gandrud, B., Chan, K. R., Baughcum, S. L. and Wallio, H. A., 1998, DC-8-based observations of aircraft CO, emission indices during SUCCESS: Geophys. Res. Lett., v. 25, p. 1,717-1,720.
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  • 25
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  • 10
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